I preume firstly that your motherboard has SATA connectors? If it does then you could buy a SATA drive and just install it and set that as the first boot device, its up to you but theres no need to alter the optical drives or the IDE drive for that matter as you'd be booting from the SATA.
You would either have to do a clean windows install though on the new SATA drive as if you are booting from that it needs windows to be on it. Or use something like Acronis drive image to clone the IDE drive onto the SATA. If one of your drives is either a Seagate or a Maxtor then you can download free software from Seagate that should do this.